code: def testZeroMag(self):
      mags = [0, 0, 0, 0, 0]
      freqs = [23, 500, 3200, 9000, 10000]
  
      self.assertEqualVector(Tristimulus()(freqs, mags), [0, 0, 0])
  
file_path: essentia/test/src/unittests/tonal/test_tristimulus.py
imports: from essentia_test import *
label_desc: Use image node_id 1 for calling the TestTristimulus obj's underlying member method code with example usage: obj.testZeroMag() without return types